【摘要】 麻粒岩相中常见矿物组合:斜方辉石+单斜辉石+石榴石+斜长石+石英,根据矿物反应:石榴石+单斜辉石+石英=2斜方辉石+斜长石.对于MgO-CaO-Al₂O₃-SiO₂体系结合热力学关系式推导出这一反应的地质压力计表达式:P（bar）=2237.9+12.05T+1.73TlnK,K=??.通过对内蒙古朱拉沟地区麻粒岩相矿物计算,结果与其它地质压力计比较吻合.更多还原

【Abstract】 A mineralogic geobarmeter based on the reaction garnet + clino-pyroxene + Quartz = 2 orthopyroxene + anorthite is proposed. The geo-barometric formulation is p (bar) = 2237.9 + 12.005T + 1.73T、LnK.The mineral thermodynamics data have been taken from the data base of Dexter Perkins components and anorthite in plagioclase and garnet have been modelled after wood and Banno (1973), Newton (1983) and Saxana (1984) respectively.Pressure computed from the equation for mineral data from Inner Mongolia is consistant with those of other geobarometries (Wood and Banno, 1974; Newton and Perkins, 1981; Perkins ? et., 1985).更多还原